GridNexus

GridNexus
is a graphical system for creating and executing scientific workflows in a Grid environment.

GridNexus, derived from the open source project Ptomlemy II, allows
the user to assemble complex processes involving data retrieval,
analysis and visualization by building a directed graph in a visual
environment. Such a dataflow creates a script written in a new language
called JXPL. The script can be executed either locally or in a remote
managed-job environment. (Information provided by Ron Vetter)